8PJR1 I \. 



l<i lie BO, thru the Sin'rnfn will aniline :i new import a nee t 

 as tin- last vestige of :i iiiinicK m> 'jioiip. elflC extinct. 



Three species have been i le-eri 1 MM 1 , which are thus dilleivnii 

 a ted liy < Jr:iy : 



BriOT part of the body holdin- the sln-11 l\ tin- lateral mantle 

 flaps only, so that ils last \\lioii "-ed In-low as well as 



li.rsally and vent rally. L:mi. 



I'o-terior part of the body fimiislinl \\ it h a ciicular disk ln-liv. 



t-rini; and roncralinu the shell, and having s.'inicircular lin-like 

 apiiendaues on each side. >. i .1 WU 



Posterior pail of the body as in >'. lin-i* ,- mantle jtitted with 



insular dopressions, o-ivin^ it a well-marked, reticulated 

 rhararter. S. VULGARis, Leach. 



II was tirst conjiM-tui-e.l \>y Owen that the lillercnc-e between 

 S. 1'i-mnii and S. ////> ini'ht ! sexual ; but it is now plain that 

 in the animal <d' S. Peronil cx:niiiiuMl. the disk had been torn 

 nil', an accident which ini^ht readily occni' when we consider tin 

 tenacity with which the suckers adhere to foreign objects. It is 

 quest ionable whether the " ret iciilat ions of the mantle" in &. 

 rnhifirifi ai-e s])ecilk; ; they may result from a state of irritation, 

 as in the octopods. I am not disposed to place niueh dependence 

 on the>e ditferenees. The shells seem to be indistinguishable, 

 and it. will lie safest to irive them the name of N. Prmnii for the 



present. 



S. I'KKOMI. Lam. PL '.Hi. li^s. 4C.T 4<i ( .) ; |>l. Hi."), li<;-. ;').s."). 



Animal :i> described in the family characters (p. llKl). Shell 

 naci-eoiis. cylindrical, conical, taper'nii:. involnli- on the same 

 plane, the whorls separate from each o! her and chambered ; g< 

 cf.ncave outwards, with a shelly, ven. rally placed funnel-shaped 

 siphonal mbe attached to each ; las! chamber rather the largest ; 

 the nuclear chamber roundish, swollen. I'sunl diameter. L'II _'_' 



mill. 



Atlantic and Pacific Oce> 



Shells a IT di'it'ted occa-ionalh upon the Atlantic shores of t he 

 Tinted State- .MS fa r north as New Kn<_rland. Mediterranean. 

 iJrcal P.i'itain. \"er\ common in the Caribbean Sea and on t he 

 shores of Australia. New Xealand. Cape of (iood Hope. etc. 



